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Table 2b. (Continued) Limiting Dimensions of ANSI General Purpose Acme Single-Start Screw Threads ASME/ANSI B1.5-1988 Nominal Diameter, D 1 1 ⁄ 2 1 3 ⁄ 4 2 2 1 ⁄4 2 1 ⁄ 2 2 3 ⁄ 4 3 3 1 ⁄2 4 4 1 ⁄2 5 Threads per Inch a 4 4 4 3 3 3 2 2 2 2 2 Limiting Diameters External Threads Classes 2G, 3G, and 4G { Max (D) 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.5000 4.0000 4.5000 5.0000 Major Diameter Min 1.4875 1.7375 1.9875 2.2333 2.4833 2.7333 2.9750 3.4750 3.9750 4.4750 4.9750 Classes 2G, 3G, and 4G Machinery's Handbook 27th Edition Minor Diameter Max 1.2300 1.4800 1.7300 1.8967 2.1467 2.3967 2.4800 2.9800 3.4800 3.9800 4.4800 Class 2G, Minor Diameter Min 1.1965 1.4456 1.6948 1.8572 2.1065 2.3558 2.4326 2.9314 3.4302 3.9291 4.4281 Class 3G, Minor Diameter Min 1.2144 1.4640 1.7136 1.8783 2.1279 2.3776 2.4579 2.9574 3.4568 3.9563 4.4558 Class 4G, Minor Diameter Min 1.2189 1.4686 1.7183 1.8835 2.1333 2.3831 2.4642 2.9638 3.4634 3.9631 4.4627 Class 2G, Pitch Diameter { Max Min 1.3652 1.3429 1.6145 1.5916 1.8637 1.8402 2.0713 2.0450 2.3207 2.2939 2.5700 2.5427 2.7360 2.7044 3.2350 3.2026 3.7340 3.7008 4.2330 4.1991 4.7319 4.6973 Class 3G, Pitch Diameter { Max Min 1.3677 1.3573 1.6171 1.6064 1.8665 1.8555 2.0743 2.0620 2.3238 2.3113 2.5734 2.5607 2.7395 2.7248 3.2388 3.2237 3.7380 3.7225 4.2373 4.2215 4.7364 4.7202 Class 4G, Pitch Diameter { Max Min 1.3701 1.3627 1.6198 1.6122 1.8693 1.8615 2.0773 2.0685 2.3270 2.3181 2.5767 2.5676 Internal Threads 2.7430 2.7325 3.2425 3.2317 3.7420 3.7309 4.2415 4.2302 4.7409 4.7294 Classes 2G, 3G, and 4G { Min 1.5200 1.7700 2.0200 2.2700 2.5200 2.7700 3.0200 3.5200 4.0200 4.5200 5.0200 Major Diameter Max 1.5400 1.7900 2.0400 2.2900 2.5400 2.7900 3.0400 3.5400 4.0400 4.5400 5.0400 Classes 2G, 3G, and 4G { Min 1.2500 1.5000 1.7500 1.9167 2.1667 2.4167 2.5000 3.0000 3.5000 4.0000 4.5000 Minor Diameter Max 1.2625 1.5125 1.7625 1.9334 2.1834 2.4334 2.5250 3.0250 3.5250 4.0250 4.5250 Class 2G, Pitch Diameter { Min 1.3750 1.6250 1.8750 2.0833 2.3333 2.5833 2.7500 3.2500 3.7500 4.2500 4.7500 Max 1.3973 1.6479 1.8985 2.1096 2.3601 2.6106 2.7816 3.2824 3.7832 4.2839 4.7846 Class 3G, Pitch Diameter { Min 1.3750 1.6250 1.8750 2.0833 2.3333 2.5833 2.7500 3.2500 3.7500 4.2500 4.7500 Max 1.3854 1.6357 1.8860 2.0956 2.3458 2.5960 2.7647 3.2651 3.7655 4.2658 4.7662 Class 4G, Pitch Diameter { Min 1.3750 1.6250 1.8750 2.0833 2.3333 2.5833 2.7500 3.2500 3.7500 4.2500 4.7500 Max 1.3824 1.6326 1.8828 2.0921 2.3422 2.5924 2.7605 3.2608 3.7611 4.2613 4.7615 a All other dimensions are given in inches. The selection of threads per inch is arbitrary and for the purpose of establishing a standard. Copyright 2004, Industrial Press, Inc., New York, NY 1830 ACME SCREW THREADS
Machinery's Handbook 27th Edition Table 3. General Purpose Acme Single-Start Screw Thread Data ASME/ANSI B1.5-1988 Identification Basic Diameters Thread Data Nominal Sizes (All Classes) Threads per Inch, a n Classes 2G, 3G, and 4G Pitch, P Thickness at Pitch Line, t = P/2 Basic Height of Thread, h = P/2 Basic Width of Flat, F = 0.3707P Lead Angle λ at Basic Pitch Diametera Classes 2G, 3G,and 4G Shear Areab Class 3G Stress Areac Major Pitch Minor Diameter, Diameter, Diameter, D D2 = D − h D1 = D − 2h Deg Min Class 3G 1 ⁄4 16 0.2500 0.2188 0.1875 0.06250 0.03125 0.03125 0.0232 5 12 0.350 0.0285 5 ⁄16 14 0.3125 0.2768 0.2411 0.07143 0.03571 0.03571 0.0265 4 42 0.451 0.0474 3 ⁄8 12 0.3750 0.3333 0.2917 0.08333 0.04167 0.04167 0.0309 4 33 0.545 0.0699 7 ⁄16 12 0.4375 0.3958 0.3542 0.08333 0.04167 0.04167 0.0309 3 50 0.660 0.1022 1 ⁄2 10 0.5000 0.4500 0.4000 0.10000 0.05000 0.05000 0.0371 4 3 0.749 0.1287 5 ⁄8 8 0.6250 0.5625 0.5000 0.12500 0.06250 0.06250 0.0463 4 3 0.941 0.2043 3 ⁄4 6 0.7500 0.6667 0.5833 0.16667 0.08333 0.08333 0.0618 4 33 1.108 0.2848 7 ⁄8 6 0.8750 0.7917 0.7083 0.16667 0.08333 0.08333 0.0618 3 50 1.339 0.4150 1 5 1.0000 0.9000 0.8000 0.20000 0.10000 0.10000 0.0741 4 3 1.519 0.5354 11 ⁄ 8 5 1.1250 1.0250 0.9250 0.20000 0.10000 0.10000 0.0741 3 33 1.751 0.709 11 ⁄ 4 5 1.2500 1.1500 1.0500 0.20000 0.10000 0.10000 0.0741 3 10 1.983 0.907 13 ⁄ 8 4 1.3750 1.2500 1.1250 0.25000 0.12500 0.12500 0.0927 3 39 2.139 1.059 11 ⁄ 2 4 1.5000 1.3750 1.2500 0.25000 0.12500 0.12500 0.0927 3 19 2.372 1.298 13 ⁄ 4 4 1.7500 1.6250 1.5000 0.25000 0.12500 0.12500 0.0927 2 48 2.837 1.851 2 4 2.0000 1.8750 1.7500 0.25000 0.12500 0.12500 0.0927 2 26 3.301 2.501 21 ⁄ 4 3 2.2500 2.0833 1.9167 0.33333 0.16667 0.16667 0.1236 2 55 3.643 3.049 21 ⁄ 2 3 2.5000 2.3333 2.1667 0.33333 0.16667 0.16667 0.1236 2 36 4.110 3.870 23 ⁄ 4 3 2.7500 2.5833 2.4167 0.33333 0.16667 0.16667 0.1236 2 21 4.577 4.788 3 2 3.0000 2.7500 2.5000 0.50000 0.25000 0.25000 0.1853 3 19 4.786 5.27 31 ⁄ 2 2 3.5000 3.2500 3.0000 0.50000 0.25000 0.25000 0.1853 2 48 5.73 7.50 4 2 4.0000 3.7500 3.5000 0.50000 0.25000 0.25000 0.1853 2 26 6.67 10.12 41 ⁄ 2 2 4.5000 4.2500 4.0000 0.50000 0.25000 0.25000 0.1853 2 9 7.60 13.13 5 2 5.0000 4.7500 4.5000 0.50000 0.25000 0.25000 0.1853 1 55 8.54 16.53 a All other dimensions are given in inches. b Per inch length of engagement of the external thread in line with the minor diameter crests of the internal thread. Figures given are the minimum shear area based on max D 1 and min d 2 . c Figures given are the minimum stress area based on the mean of the minimum minor and pitch diameters of the external thread. See formulas for shear area and stress area on page 1827. Copyright 2004, Industrial Press, Inc., New York, NY ACME SCREW THREADS 1831
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